What is the rate at which distance changes called

Using the given data table, calculate the acceleration of the skateboarder. you can use either form of the equation below?

If you put a helium-filled balloon in the refrigerator, what will happen?

This chart shows characteristics of three different types of waves. which statement is best supported by the information in the chart? wave x and wave y are mechanical waves, and wave z is an electromagnetic wave. wave x and wave y are electromagnetic waves, and wave z is a mechanical wave. wave x and wave z are electromagnetic waves, and wave y is a mechanical wave. wave x and wave z are mechanical waves, and wave y is an electromagnetic wave.